Profile: Support
You should create the grouped product and add simple products in the nopcommerce dashboard. Open the grouped product and select the template "Modular products".
After it you should open the menu FoxNetSoft-Modular Products. Configure the default quantity for each simple product. That's all.
1. Try to upgrade the plugin and use 1.26
2. Open the list of all settings of nopcommerce and look for the item "PayPalStandardProPaymentSettings.WebProfileId", remove it.
The plugin will create a new profile.
I published here the solution for other customers.
The issue was in PDF logo.
https://www.nopcommerce.com/en/boards/topic/98903/argumentexception-the-data-buffer-was-empty?srsltid=AfmBOorYXUv-E-GuMzqcULgLQNhk4zablddfYnKt_AxMp1cumeXNwbzA
Could you try to upgrade the PayPal payment plugin and try the new release?
Open the plugin configure page and enable debugging.
Clear the plugin log file and try to checkout.
Check the plugin log file.
Do you see the shipping address in the JSON?
I would like to be sure that the JSON doesn't have a shipping address.
Make a print screen of the plugin configure page and send to email support@foxnetsoft.com
Thank you for your ideas.
What nopcommerce version do you use?
Check if the theme uses this widgetzone
PublicWidgetZones.BodyEndHtmlTagBefore
Maybe you removed it.
You should open the file Checkout/Completed.cshtml.
This file has a model OrderModel.
Use this file.